Motion Test - 7...

In case of uniform circular motion, the acceleration is

A particle has an initial velocity of 9 m/s due east and a constant acceleration of 2 m/s² due west. The distance covered by the particle in the 5^th second of its motion is

A particle moves along the x- axis as follows:

It starts from rest at t = 0 from a point x = 0 and comes to rest at t = 1 at a point x = 1. No other information is available about its motion for the intermediate time (0 < t < 1). If α denotes the instantaneous acceleration of the particle, then

A person travels along a straight road for the first half-length with a constant speed v₁ and the second half-length with a constant speed v₂. The average speed v is

The displacement s of a point moving in a straight line is given by s = 8t² + 5t - 5, where s being in cm and t in s. The initial velocity of the particle is

A ball is dropped from a height of 90 m. Its velocity just before touching the floor is (g = 10 ms^-2)

A ball is thrown upwards with a velocity v. It attains a height of 50 m and comes back to the thrower. Choose the correct statement. (g = 10 m/s²)

The acceleration due to gravity on the Moon is one-sixth that on the Earth. A high-jumper can jump 2 m on Earth. What distance can he jump on the Moon?

A particle starts moving from the position of rest under a constant acceleration. If it travels a distance x in the first 10 seconds and distance y in the next 10 seconds, then

Tripling the speed of a motor car multiplies the distance needed for stopping it by

A ball is released from the top of a tower of height h metres. It takes T seconds to reach the ground. Where is the ball at the time T/2 seconds?

A pebble is thrown vertically upwards from a bridge with an initial velocity of 4.9 m/s. It strikes the water after 2 s. The height of the bridge is

A bomb is released by a horizontally flying aeroplane. The trajectory of the bomb is a

A river is flowing at the rate of 50 km/h. A person, who can row the boat at 10 km/h, wants to reach a point just opposite on the other bank of the river. He should row

An observer moves with a constant speed along a line joining two stationary objects. He will observe that the two objects

a. have the same speed
b. have the same velocity
c. move in the same direction
d. move in opposite directions

Which of the above statements are correct?

The velocity of light emitted by a source S, observed by an observer O, who is at rest with respect to S is c. If the observer moves towards S with velocity v, the velocity of light as observed will be

A wooden block is dropped from the top of a cliff 100 m high and simultaneously a bullet of mass 10 g is fired from the foot of the cliff upwards with a velocity of 100 m/s. The bullet and wooden block will meet each other after a time

A parachutist steps from an aircraft, falls freely for two seconds, and then opens his parachute. Which of the following acceleration-time (a - t) graphs best represents his downward acceleration during the first 5 seconds?

The area of the shaded portion of the graph represents

Rotatory motion of a body is produced by applying a/an